first version finished

django/views/i18n.pyi

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+from django.core.handlers.wsgi import WSGIRequest
+from django.http.response import (
+    HttpResponse,
+    HttpResponseRedirect,
+    JsonResponse,
+)
+from typing import (
+    Any,
+    Dict,
+    List,
+    Optional,
+    Union,
+)
+
+
+def get_formats() -> Dict[str, Union[str, int, List[str]]]: ...
+
+
+def set_language(request: WSGIRequest) -> HttpResponseRedirect: ...
+
+
+class JSONCatalog:
+    def render_to_response(
+        self,
+        context: Dict[str, Union[Dict[str, Union[str, List[str]]], Dict[str, Union[str, int, List[str]]], str]],
+        **response_kwargs
+    ) -> JsonResponse: ...
+
+
+class JavaScriptCatalog:
+    @property
+    def _num_plurals(self) -> int: ...
+    @property
+    def _plural_string(self) -> Optional[str]: ...
+    def get(self, request: WSGIRequest, *args, **kwargs) -> HttpResponse: ...
+    def get_catalog(self) -> Dict[str, Union[str, List[str]]]: ...
+    def get_context_data(self, **kwargs) -> Dict[str, Any]: ...
+    def get_paths(self, packages: List[str]) -> List[str]: ...
+    def get_plural(self) -> Optional[str]: ...
+    def render_to_response(
+        self,
+        context: Dict[str, Union[Dict[str, Union[str, int, List[str]]], None, Dict[str, str], Dict[str, Union[str, List[str]]]]],
+        **response_kwargs
+    ) -> HttpResponse: ...